Inhibition of Chlorella growth by the lipids of cyanobacterium Microcystis aeruginosa

Abstract

The total lipids of the cyanobacterium Microcystis aeruginosa have been isolated and fractionated into its components. Of these lipid components, only the fatty acid-containing fraction inhibited the growth of the green alga Chlorella pyrenoidosa . The inhibitory activity appears to be due to linoleic and linolenic acids, which are both present in significants quantities . These acids may be the substances responsible for the reported toxicity of Microcystis aeruginosa to Chlorella.

Insecticidal compounds against mosquito larvae fromOscillatoria agardhii strain 27

“…1998; Ikawa et al, 1996;Morohashi et al 1991 . Based on the results obtained from the present and previous studies, the activity of unsaturated fatty acids to mosquito larvae may be derived from the inhibition of Na q rK q -ATPase.…”

“…Unsaturated fatty acids extracted from Aphanizomenon flos-aquae and Microcystis aeruginosa inhibit the growth of the green Ž . algae Chlorella Ikawa et al, 1996 . Furthermore, fatty acids from Microcystis aeruginosa had shown the potential to inhibit potently fish gill Na q rK q -ATPase activ-Ž .…”

Allelopathic effects of submerged macrophytes on phytoplankton

“…M. aeruginosa was shown to allelopathically inhibit the growth of Chlorella pyrenoidosa by linoleic and linolenic acids (Ikawa et al, 1996) and the freshwater dinoflagellate Peridinium gatunense (Sukenik et al, 2002). Also Harrass et al (1985) and Gregor et al (2008) When tested without interaction (100%), particle-, biovolume-, and chl a-based growth rates of M. aeruginosa were not affected or even slightly enhanced (chl a) by TA in exp.…”

Mosquito Larvicides from Cyanobacteria

“…Direct competition for nutrients also occurs between cyanobacteria and eukaryotic algae. Ikawa et al (1996) found that unsaturated fatty acids purified from the cyanobacterium Aphanizomenon flos-aquae inhibited the growth of Chlorella. These findings do suggest that unsaturated fatty acids could be used by cyanobacteria to outcompete sympatric organisms.…”